@ 7 V speed, which is a little less loud edit : strangely enough this would be in fact @7V. I found a way to get them less louder, which would be @5V. But I have not measure the voltage. I will post pictures later. (29/05/08 09.22 AM Brussels time)IMG_5228.JPG56.62KB921 downloads

Posted 09 May 2008 - 12:38 PM

vaporATX

InsanelyMac Blowhard

Donators

898 posts

Gender:Male

Location:New Orleans, LA

Kinda off topic here, but it does relate to the issues of the fans used in these machines and the similar fans in the Mac Pro. Have any of you heard a MacPro under load? Thing sounds like a helicopter spooling up for take off. Why is it that Apple uses such loud inefficient fans? I mean it's not like these machines are cheap. I mean a three blade high pitch fan? Are they crazy? Have any of you using these cases thought of maybe replacing these fans with some 92 mm seven blade Silenx fluidic bearing fans painted to match the stock fans?

Posted 29 May 2008 - 07:08 AM

Baudouin

InsanelyMac Sage

Members

420 posts

Gender:Male

Location:Brussels, Belgium

I made this Diagram for the Back G5 Fans

Please tell if there are any mistakes so I can fix it

Great amantheboy08!!! Nice and clear draw! Congratz. If you could specify that's the connection @ 12V, which is loud. If you would make another draw with the connection @ 7V, it would be perfect. In the meantime I found the way to connect @5V, which is very silent but really slow.

Your diagrams are correct, based on my pictures showing what I would call the "test connections" when I was trying to find the good combinations. Just one thing I used a double Molex plug from an Y cables . That's why on your dia, there are two yellows and reds on the right side of the Molex and two blacks together. Which could be confusing, it would be better to show only one of each yellow and red and two separated black as on an usual molex. Check the next picture on the right side, it should be the same on your Molex right side on the upper draw from each diagram.The left side of the next picture shows the Y double wiring .Thanks.IMG_5274.JPG66.21KB467 downloads

After soldering, the wires connections are different : I soldered all voltage wires from the fan to one wire, red in this case. and the RPM's and neutrals from the fans are connected separately to one neutral from the Molex.IMG_5289.JPG75.98KB414 downloadsIMG_5290.JPG72.43KB245 downloadsIMG_5282.JPG70.47KB276 downloadsIMG_5283.JPG43.7KB228 downloads

Concerning the 5V connection, I discovered that if I connect the Voltage wires from the fans to the red from the Molex and the RPM's from the fans to the neutral from the Molex, without connecting the Fans neutrals to the neutral from the Molex, I get a very slow speed I guess must be 5V .

Neutrals fans and red : too fast to be 5V, less fast and noisy than 12VIMG_5285.JPG46.71KB222 downloadsRPM's from fans and red : very slow could be 5VIMG_5284.JPG54.65KB211 downloadsWill test with a PSU fan onto the molex and compare the speeds with the G5 fans.

Posted 01 June 2008 - 05:26 AM

teknojunkie

InsanelyMac Legend

Donators

829 posts

Gender:Male

Location:Corona, California USA

Interests:Computers, Coding, Skateboarding, Snowboarding, Video Games

Your diagrams are correct, based on my pictures showing what I would call the "test connections" when I was trying to find the good combinations. Just one thing I used a double Molex plug from an Y cables . That's why on your dia, there are two yellows and reds on the right side of the Molex and two blacks together. Which could be confusing, it would be better to show only one of each yellow and red and two separated black as on an usual molex. Check the next picture on the right side, it should be the same on your Molex right side on the upper draw from each diagram.The left side of the next picture shows the Y double wiring .Thanks.IMG_5274.JPG66.21KB467 downloads

After soldering, the wires connections are different : I soldered all voltage wires from the fan to one wire, red in this case. and the RPM's and neutrals from the fans are connected separately to one neutral from the Molex.

Concerning the 5V connection, I discovered that if I connect the Voltage wires from the fans to the red from the Molex and the RPM's from the fans to the neutral from the Molex, without connecting the Fans neutrals to the neutral from the Molex, I get a very slow speed I guess must be 5V .

Neutrals fans and red : too fast to be 5V, less fast and noisy than 12V

RPM's from fans and red : very slow could be 5V

Will test with a PSU fan onto the molex and compare the speeds with the G5 fans.

Very nice baudouin, also coud you make a pinout for this like where each wire goes so i can make a diagram out of it thanks I tried the 21V Cools really good, but loud as hell, gonna try the 5v all we need is a 3 way switch to switch from 12v, 7v and 5v. did u try the G5 cpu fans.

Posted 02 June 2008 - 08:50 PM

Baudouin

InsanelyMac Sage

Members

420 posts

Gender:Male

Location:Brussels, Belgium

Very nice baudouin, also coud you make a pinout for this like where each wire goes so i can make a diagram out of it thanks I tried the 21V Cools really good, but loud as hell, gonna try the 5v all we need is a 3 way switch to switch from 12v, 7v and 5v. did u try the G5 cpu fans.

Thanks. I am three days home from tomorrow and I will work on the pinout. I guess you meant 12V, not really 21V ? I did not try the CPU fans because I cannot use them, the way I install my Mobo inside the opening door as in the G3, G4 tower cases. But I had a look and it should be easier than the back fans.

edit: wrong assumption :

The are also 6 connections, 2 double wires, one wire from each fan, one double is for 5V to connect to the red cable from molex and one for the neutral to connect to the black from the molex. And then there are four single wires I guess also one per fan for RPM and the other for 12V to connect to the yellow cable from the molex. I have checked this after my night shift. I hoped the people from Apple have been logical, but no. The wires are connected to the Apple plug on two lines, two singles on the way up and four on the bottom line,the two double on the right side and the two single on the left side if you take the plug facing you with the small plastic thing above. It does not mean that the two above are for RPM and the four at the bottom are connected as on a molex . I explain in the next post how to. In the evening after 08.00 PM Brussels time I will take some pictures and make a pinout.See you later alligator.

Posted 03 June 2008 - 01:32 PM

Baudouin

InsanelyMac Sage

Members

420 posts

Gender:Male

Location:Brussels, Belgium

OK I just slept some hours and test the CPU fans. The four at the bottom are to be connected as:
the external double to 5V red cable, the internal double to the neutral black cable, the external single to 12 V yellow cable fan A and the internal single not applicable or to black cable cause is the RPM for fan A. The two upper cables are : the external single to 12V yellow cab fan B and the internal single N/A or black : RPM fan B.
These connections are of course very loudy : 12V . You reduce to 5V by connecting all voltage cables 12V and 5V to the red cable from the molex .
Pictures and pinout later on, got to sleep...

Posted 07 June 2008 - 08:17 AM

Baudouin

InsanelyMac Sage

Members

420 posts

Gender:Male

Location:Brussels, Belgium

You just use a molex connector watch go from right to left the 12v(red) connects to the first wire, the two grounds(the 2 middle cable), and the 5v (yellow) connects to the last one. You can make them quieter by spliting the 5v on one molex and the 12v's on one molex.

I put a Pic at the top

amantheboy08, concerning the colours, it is the other way around, yellow=12V and red=5V